Green coffee beans are coffee beans that have not been roasted yet; essentially raw coffee beans. Roasting coffee beans reduces the levels of chlorogenic acid, an acid that is thought to have multiple health benefits. Green coffee bean extract is the nutrients extracted from these beans, mostly a combination of the chlorogenic acid and caffeine as well as antioxidants.
The Bottom Line – Green coffee bean extract is the nutrients taken from coffee beans that have not yet been roasted, primarily chlorogenic acid.
Green Coffee Bean Extract Health Benefits
Green coffee beans are thought to have multiple health benefits and became sought-after when Dr. Oz featured them on his health show in 2012, calling them “the green coffee bean that burns fat fast” and claiming that users did not need to diet or exercise to see the effects.
Below is a list of the possible benefits we’ve found:
Green Coffee Bean Extract Can Help With Weight Loss
Green coffee bean extract may be able to help with weight loss. It has been found that obese adults who took a specific green coffee bean extract five times per day for 8-12 weeks lost between 2.5kg to 3.7kg more than study participants who took a placebo or drank roasted coffee instead of taking the raw supplement. Another study found that taking the supplement reduced visceral fat in participants; caffeine is known to help with weight loss so this may account for the extract’s effects. 
Green Coffee Bean Extract Can Help Reduce Blood Pressure
Research suggests that green coffee bean extract can help reduce blood pressure; Japanese adults who took extracts containing between 50mg and 140mg of chlorogenic acid had a reduction in systolic blood pressure of between 5 and 10 mmHg and a reduction in diastolic blood pressure of between 3 and 7 mmHg.
Another study found that ferulic acid, a compound of chlorogenic acid in green coffee bean extract, helped hypertension by preventing the clumping of platelets and therefore the hardening of the arteries. 
Green Coffee Bean Extract Can Boost Your Energy Levels
Just like a cup of your favorite joe, green coffee bean extract contains caffeine that can keep you alert and energetic throughout the day. Green coffee beans have significantly less caffeine in than roasted coffee, but the powdered nature of the extract means that it is easy to consume high quantities of it. 
The Bottom Line – Green coffee bean extract is in the early stages of research; currently there is some evidence that certain doses of extract can contribute towards weight loss and reduction in blood pressure as well a boost in energy levels.
How To Use Green Coffee Bean Extract
If you wish to use green coffee beans as a health supplement, eating them is not an option as they are hard and tasteless and roasting them denatures the beneficial nutrients.
The most common methods of taking green coffee bean extract are:
The optimal dosage amount for green coffee bean is around 445mg, containing around 200mg chlorogenic acid. It is recommended that you do not exceed the dosage on your supplement bottle or take it with other supplements.
Are There Any Foods That Contain Green Coffee Bean Extract?
Currently, green coffee bean extract is sold in capsule or powder form as well as in whole bean form. Green coffee bean extract is yet to be added to snacks such as chocolate or protein bars.
Green Coffee Bean Extract Side Effects List
There are always risks to taking a new supplement, even if they have been used safely by others. The side effects experienced from consuming green coffee bean extract are thought to be mostly from the caffeine content.
The following side effects could potentially be:
Insomnia, nervousness and restlessness, sweating, stomach upset and diarrhea, anxiety, increased or irregular heart and breathing rate, headaches and ringing in the ears. 
Note: these side effects are possible but may not be the typical user experience. Consuming large amounts of caffeine increases your risk of experiencing these side effects.
Is Green Coffee Bean Extract Safe?
As green coffee bean extract is still in the early stages of research, it is said to be possibly safe to use when taken by mouth appropriately; green coffee bean extract in doses of 480mg daily or 200mg five times daily has been used safely in clinical studies.
Remember, prior to using green coffee bean extract, you should consult with your doctor if you have any kind of medical condition.
When Should I Not Take Green Coffee Bean Extract?
- If you are pregnant and/or breast-feeding: There has not been enough research carried out about consuming green coffee bean extract whilst pregnant or breastfeeding to deem it safe to do so.
- If you’re a child under the age of 18: Green coffee bean extract has not been tested on children and should not be given to those under the age of 18.
- If you have anxiety: The caffeine in green coffee bean extract could make anxiety worse.
- If you have a bleeding disorder: The caffeine in green coffee bean extract could make bleeding disorders worse.
- If you have diarrhea: The caffeine in the extract could make diarrhea worse.
- If you have glaucoma: The caffeine in the extract can increase pressure within the eye.
- If you have high blood pressure: The caffeine in the extract may increase blood pressure, although symptoms may be less for people used to drinking caffeine.
- If you have osteoporosis: The caffeine in the extract may increase the amount of calcium that is flushed out in urine.
Green coffee bean extract is a popular source of discussion among medical professionals and it will be interesting to see the results of further research in clinical studies. Those wishing to take it for weight loss purposes should seek medical advice and not exceed the dose stated on the supplement bottle.